From patchwork Fri Oct 16 02:48:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 11840751 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EFD7C14B4 for ; Fri, 16 Oct 2020 02:48:50 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A7230214DB for ; Fri, 16 Oct 2020 02:48:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="1vuDaLwn" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A7230214DB Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 72EFE940061; Thu, 15 Oct 2020 22:48:49 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 6B71C940034; Thu, 15 Oct 2020 22:48:49 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5A67C940061; Thu, 15 Oct 2020 22:48:49 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0243.hostedemail.com [216.40.44.243]) by kanga.kvack.org (Postfix) with ESMTP id 273C7940034 for ; Thu, 15 Oct 2020 22:48:49 -0400 (EDT) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id C53571EE6 for ; Fri, 16 Oct 2020 02:48:48 +0000 (UTC) X-FDA: 77376255936.17.show86_400d54127219 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin17.hostedemail.com (Postfix) with ESMTP id AA519180D0180 for ; Fri, 16 Oct 2020 02:48:48 +0000 (UTC) X-Spam-Summary: 10,1,0,1c964e6981880b3a,d41d8cd98f00b204,akpm@linux-foundation.org,,RULES_HIT:41:355:379:800:960:967:973:982:988:989:1260:1345:1359:1381:1431:1437:1534:1541:1711:1730:1747:1777:1792:2197:2199:2393:2525:2559:2563:2682:2685:2859:2902:2933:2937:2939:2942:2945:2947:2951:2954:3022:3138:3139:3140:3141:3142:3353:3653:3866:3867:3870:3871:3874:3934:3936:3938:3941:3944:3947:3950:3953:3956:3959:4321:5007:6119:6261:6653:7576:7903:7974:8957:9025:9545:10004:11026:11473:11658:11914:12043:12048:12297:12438:12517:12519:12555:12679:13069:13161:13229:13311:13357:13846:14181:14384:14721:21080:21221:21451:21627:21889:21939:21990:30054:30056:30070,0,RBL:198.145.29.99:@linux-foundation.org:.lbl8.mailshell.net-62.2.0.100 64.100.201.201;04y8zte5gygasru3wt44t91efiwwyopsx976n11r9xkmm99teu64zfbwtj657kw.9n1jng8jme3ftmfbfki7h7aahxrjqq51snoi9gm6it54mp9q7j6dg51aatq4ir8.1-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fp,MSBL: 0,DNSBL: X-HE-Tag: show86_400d54127219 X-Filterd-Recvd-Size: 3028 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf30.hostedemail.com (Postfix) with ESMTP for ; Fri, 16 Oct 2020 02:48:48 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2A278208C7; Fri, 16 Oct 2020 02:48:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602816527; bh=UQtxO27mP7LnnB9J3mHTWveaJm6JyhxyLXNoFOud3wE=; h=Date:From:To:Subject:In-Reply-To:From; b=1vuDaLwnVClBJJIXmOd5I27hBhME9GvulTeYNMZ82Jh3flPJtCsvTywP8m8dYwJJ6 wmVzaPkhXs29UlJdt5m1OVLUJz1HgVwpQtshaA+H3BHki7Jt7YoPcwVBvQ5aQQpNuX iXvsvQTjXcVRo+RbjrSkOy/joQy97koHstpi5sbI= Date: Thu, 15 Oct 2020 19:48:46 -0700 From: Andrew Morton To: akpm@linux-foundation.org, joe@perches.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, torvalds@linux-foundation.org Subject: [patch 123/156] checkpatch: add test for comma use that should be semicolon Message-ID: <20201016024846.DOnyVAmXC%akpm@linux-foundation.org> In-Reply-To: <20201015192732.f448da14e9854c7cb7299956@linux-foundation.org> User-Agent: s-nail v14.8.16 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Joe Perches Subject: checkpatch: add test for comma use that should be semicolon There are commas used as statement terminations that should typically have used semicolons instead. Only direct assignments or use of a single function or value on a single line are detected by this test. e.g.: foo = bar(), /* typical use is semicolon not comma */ bar = baz(); Add an imperfect test to detect these comma uses. No false positives were found in testing, but many types of false negatives are possible. e.g.: foo = bar() + 1, /* comma use, but not direct assignment */ bar = baz(); Link: https://lkml.kernel.org/r/3bf27caf462007dfa75647b040ab3191374a59de.camel@perches.com Signed-off-by: Joe Perches Signed-off-by: Andrew Morton --- scripts/checkpatch.pl | 11 +++++++++++ 1 file changed, 11 insertions(+) --- a/scripts/checkpatch.pl~checkpatch-add-test-for-comma-use-that-should-be-semicolon +++ a/scripts/checkpatch.pl @@ -4940,6 +4940,17 @@ sub process { } } +# check if a statement with a comma should be two statements like: +# foo = bar(), /* comma should be semicolon */ +# bar = baz(); + if (defined($stat) && + $stat =~ /^\+\s*(?:$Lval\s*$Assignment\s*)?$FuncArg\s*,\s*(?:$Lval\s*$Assignment\s*)?$FuncArg\s*;\s*$/) { + my $cnt = statement_rawlines($stat); + my $herectx = get_stat_here($linenr, $cnt, $here); + WARN("SUSPECT_COMMA_SEMICOLON", + "Possible comma where semicolon could be used\n" . $herectx); + } + # return is not a function if (defined($stat) && $stat =~ /^.\s*return(\s*)\(/s) { my $spacing = $1;